.alpha.-Amino-.alpha.-methylbutyric acid 2-Amino-2-methylbutyric acid 595-40-4 Alanine, 2-ethyl- Butanoic acid, 2-amino-2-methyl- Butanoic acid, 2-amino-2-methyl-, (S)- Butyric acid, 2-amino-2-methyl- Isovaline Isovaline, L- L-Isovaline NSC1019